As I've been adding quite a few new addr:postcode tags as part of the
quarterly project to use the FHRS data, I began wondering what the
overall state of addr:postcode tags was in the UK. I've started doing
a bit of analysis, which has began by checking the OSM postcodes
against the Code-Point Open dataset.
The first output I've produced is a list of likely errors where
addr:postcode values either do not have the appropriate formatting or
do not match an entry in Code-Point Open. There's quite a large number
of such errors, although it's pretty small as a percentage of the
total addr:postcode tags.
If you're interested, have a look at
http://robert.mathmos.net/osm/postcodes/osm-errors.html and see if you
can help by fixing any of them. Some will be errors in source data,
but others could well be typos and transcription errors.
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